The absence of legs in mice has been attributed to a recessiveallele. A normal m
ID: 5137 • Letter: T
Question
The absence of legs in mice has been attributed to a recessiveallele. A normal male is mated with a normal female and theyproduce a legless offspring. The same two parents are matedagain. What is the chance of their next offspring beinglegless? If a black female guinea pig is test crossed and produces 2offspiring in each of 3 litters, all of which are black, what isher probable genotype? The absence of legs in mice has been attributed to a recessiveallele. A normal male is mated with a normal female and theyproduce a legless offspring. The same two parents are matedagain. What is the chance of their next offspring beinglegless? If a black female guinea pig is test crossed and produces 2offspiring in each of 3 litters, all of which are black, what isher probable genotype?Explanation / Answer
Since the legless trait is recessive,-l
.
heterozygous Ll x Ll heterozygous
L
l
L
LL
L l
l
L l
l l legless trait
25% chance of risk of having legless inevery issue,
as every issue is independent event
===================================
genotype is ----Bb
The female parent could be homozygous BB OR HeTEOZYGOUS Bband still be phenotypically be black,.-B
IF SHE IS HeTEOZYGOUS,each offspring from this testcross has a 50% chance of being black,
The probability of six offsprings being produced,all of which are black is (1/2)6
=0.0156=1.56% it is less 2% of the time
L
l
L
LL
L l
l
L l
l l legless trait
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